Abstract
Fast repetition rate fluorometry (FRRf) provides a potential means to examine marine primary productivity; however, FRRf-based productivity estimations require knowledge of the electron requirement (K) for carbon (C) uptake (K C) to scale an electron transfer rate (ETR) to the CO2 uptake rate. Most previous studies have derived K C from parallel measurements of ETR and CO2 uptake over relatively short incubations, with few from longer-term daily-integrated periods. Here we determined K C by comparing depth-specific, daily ETRs and CO2-uptake rates obtained from 24-h on-deck incubation experiments undertaken on seven cruises in Ariake Bay, Japan, from 2008 to 2010. The purpose of this study was to determine the extent of variability of K C and to what extent this variability could be reconciled with the prevailing environmental conditions and ultimately to develop a method for determining net primary productivity (NPP) based on FRRf measurements. Both daily ETR and K C of the upper layer varied considerably, from 0.5 to 115.7 mmol e− mg Chl-a −1 day−1 and 4.1–26.6 mol e− (mol C)−1, respectively, throughout the entire data set. Multivariate analysis revealed a strong correlation between daily photosynthetically active radiation (PAR) and K C (r 2 = 0.94). A simple PAR-dependent relationship derived from the data set was used for generating K C, and this relationship was validated by comparing the FRRf-predicted NPP with the 13C uptake measured in 2007. These new observations demonstrate the potential application of FRRf for estimating regional NPP from ETR.
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Acknowledgments
We wish to thank the captain, officers and crew of T/V-Kakuyo Maru for their admirable assistance during onboard sampling and measurements. We also thank Drs. W. Cheah, J.I. Goes and H. do R. Gomes and two reviewers for helping to improve this manuscript. This research was supported by the Global Observation Mission-Climate (GCOM-C) Project of the Japan Aerospace Exploration Agency. The contribution by D.J. Suggett was supported by an Australian Research Council Future Fellowship (FT130100202).
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Zhu, Y., Ishizaka, J., Tripathy, S.C. et al. Variation of the photosynthetic electron transfer rate and electron requirement for daily net carbon fixation in Ariake Bay, Japan. J Oceanogr 72, 761–776 (2016). https://doi.org/10.1007/s10872-016-0370-4
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DOI: https://doi.org/10.1007/s10872-016-0370-4